Answer
See below.
Work Step by Step
The sides of the rectangle will be $r,2r$. Thus:
a) $A(r)=r\cdot2r=2r^2$
b) The perimeter will be the length of the wire, so $p(r)=2(r+2r)=2\cdot3r=6r$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 3 - Section 3.6 - Mathematical Models: Building Functions - 3.6 Assess Your Understanding - Page 264: 15
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